JPH0671514A - Automatic bolt polishing device - Google Patents

Abstract

PURPOSE:To provide an automatic bolt polishing device where the labor saving through automation, the quality stabilization, the reduction of the working period or the like can be effectively executed. CONSTITUTION:An automatic bolt polishing device is provided with a body of revolution 2 of endless shape which is intermittently driven in one direction about the horizontal axis, bolt receiving parts 3 which are mounted on the body of revolution 2 separately in the rotating direction of the body of revolution 2, and in an integrated manner with the body of revolution 2 while being arranged parallel to the axial center of the body of revolution 2 with each pair mutually opposite, are opened to the outer circumferential side of the body of revolution 2 and support the parts close to both ends of a plurality of bolts A in a removable manner, a chucking mechanism 4 which holds the non-threaded part of the bolt A supported by this bolt receiving part 3 in a removable manner at the upper moving position of the body of revolution 2 and is elevated, and achieves the temporary stop at the elevated position, and a polishing mechanism of rotary brush type which is held and elevated by means of this chucking mechanism 4, approaches the stopped bolt A along the axial direction of the bolt A, and polishes the threaded part of the bolt A. The elevating side of the body of revolution 2 is a bolt supplying part B, while the lowering side is a bolt discharging part D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic polishing apparatus for polishing a threaded portion of a bolt, and more particularly to a bolt automatic polishing apparatus suitable for polishing for reuse of large stud bolts.

[0002]

2. Description of the Related Art In a nuclear power plant, for example, periodic inspections of nuclear reactor equipment are performed at regular intervals, and as part of this, internal inspections and repairs of steam turbines are also performed. In this case, the turbine casing is once opened by removing bolts and nuts which are fasteners, closed again after inspection and maintenance, and fastened with bolts and nuts.

By the way, the bolts for fastening the turbine casing are deteriorated by high heat during normal operation. Therefore, in order to ensure reliability in reuse during assembly, it is necessary to repair the screw portion by polishing.

Conventionally, such polishing is carried out individually by a worker who holds the bolts and fixes them and manually using a wire brush.

[0005]

However, for fastening the turbine casing, a large number of bolts such as stud bolts are used in addition to the usual bolts, and when these are all manually polished, a large amount of bolts are required. It takes time and labor, and the work efficiency is very poor. Particularly in a large stud bolt, since screws are formed at both ends, it is difficult to grip and work is difficult, and the finished state of polishing often varies.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an automatic bolt polishing apparatus which can effectively achieve automatic labor saving, quality stabilization, and shortening of the construction period.

[0007]

In order to achieve the above-mentioned object, an automatic bolt polishing apparatus according to the present invention is an endless belt-shaped rotating body which is intermittently driven in one direction around a horizontal axis, and this rotating body. At a distance in the direction of rotation of the rotary body and in parallel with the axis of the rotary body so as to face each other and to rotate integrally with the rotary body. A bolt receiver that detachably supports the vicinity of both ends, and a non-screw portion of the bolt supported by the bolt receiver is detachably gripped at the upper moving position of the rotating body to move up and down, and its raised position. The chucking mechanism that stops for a moment and the bolt that is gripped and stopped by the chucking mechanism and moves closer to the bolt along the axial direction of the bolt,
A rotary brush type polishing mechanism for polishing the threaded portion of the bolt is provided, and the ascending side of the rotating body is a bolt supply section and the descending side is a bolt discharge section.

[0008]

During polishing, bolts are sequentially supplied to the bolt receiver from the bolt supply portion set on the rising side of the rotating body, and the bolts supported by the bolt receiver are intermittently driven by driving the rotating body. Is conveyed upward.

The transported bolts stop intermittently at the upper rotation position, and a chucking mechanism provided at a portion corresponding to the stop position grips and lifts the bolt at a substantially intermediate position in the axial direction. It stops at a predetermined elevated position and is positioned and fixed.

With respect to the positioned bolt, the polishing mechanism moves closer along the axial direction of the bolt during the stop time set in the intermittent drive, and the thread portion of the bolt is polished by the rotary brush type operation.

After the polishing is completed, the polishing mechanism is separated along the axial direction of the bolt, the chucking mechanism is lowered, and the polished bolt is returned to the bolt receiver again. After that, the rotating body again intermittently rotates, the next bolt stops at the upper rotation position, and the gripping by the chucking mechanism and the polishing action by the polishing mechanism similar to the above are sequentially performed.

The bolt returned to the bolt receiver is supplied downward by the rotating body and then discharged to a predetermined discharge portion.

Therefore, according to the present invention, by simply supplying the bolt to be polished to the bolt receiver, the bolt is automatically gripped by the chucking mechanism and automatically by the rotating brush type polishing mechanism. Since the bolts after being polished are automatically discharged by the discharging mechanism, a series of operations for feeding, polishing, and discharging the bolts can be performed automatically and continuously without requiring any manpower. As a result, it is possible to effectively improve the work efficiency and shorten the construction period. In particular, with respect to the polishing work of large stud bolts for turbine casings, the labor can be significantly reduced as compared with the conventional work.

Moreover, since the polishing work for each bolt is mechanically performed and the finish is uniform, the polishing quality can be stabilized.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the overall construction of the apparatus,
3 to 5 show a partial configuration.

This embodiment relates to an example of polishing a stud bolt, in which a pedestal 1 with casters 1a movable on the floor, a rotating body 2, a bolt holder 3, and a chucking mechanism 4 are used.
And a polishing mechanism 5 is provided. 1b is a stand 1
Is a handle for moving operation of.

The rotating body 2 is a pair of left and right endless chains 2.
It is composed of a and is intermittently driven in one direction a around the horizontal axis by a motor 7 via a chain wheel 6.

The bolt receivers 3 are provided along the rotation direction a of the rotating body 2 at intervals and in parallel with the axis of the rotating body 2 so as to face each other and to rotate integrally with the rotating body 2. The outer periphery of the rotating body 2 is opened to detachably support the vicinity of both ends of the plurality of bolts A.

The rising side of the rotating body 2 is a bolt supplying section B, the upper moving side is a polishing section C, and the descending side is a bolt discharging section D.

The chucking mechanism 4 detachably grips the non-threaded portion A2 of the bolt A supported by the bolt holder 3 at the polishing portion C, which is the upper moving position of the rotating body 2, and moves up and down. It is designed to stop once in the raised position. That is, the chucking mechanism 4 slidably supports a pair of chucks 8 having opposed surfaces, which are arranged in the center of the pedestal 1 so as to be opposed to each other, on a horizontal upper surface of a support block 9.
These chucks 8 are placed in the opposite direction b by an air cylinder.
The support block 9 is moved up and down and the support block 9 is moved up and down.
It is structured such that it can be raised and lowered by 0. The elevating device 10 has a pair of vertical air cylinders 12a and 12b supported on a pedestal 1 via brackets 11, and when rising, the first air cylinder 12a and the second air cylinder 12b.
In this order, and when descending, they are driven up and down in the vertical direction c.

The chucking mechanism 4 includes an air header 1
Controlled by a control device including 3 and started after detecting that the bolt A has come to the polishing position by the proximity sensor 14 arranged on the pedestal 1, the bolt A is received from the bolt receiver 3 and rises, It stops during polishing by the polishing mechanism 5 described below, and descends after polishing is completed.

The polishing mechanism 5 is of a rotating brush type construction that moves closer to the bolt A which is gripped and lifted by the chucking mechanism 4 and stopped along the axial direction of the bolt A, and polishes the threaded portion A1 of the bolt A. ing.

That is, as shown in FIGS. 3 to 5, a pair of polishing mechanisms 5 are arranged on the pedestal 1 so as to face each other, and each polishing mechanism 5 is provided on both sides of the pedestal 1 in a foldable manner. Each of them is supported by a wing-shaped rotation support device 15. The rotation support device 15 includes a horizontal pin 16a on the gantry 1.
Pivot arm 17 supported via a pin 16
An air spring 18 horizontally supporting the rotating arm 17 via b is provided, and the rotating arm 17 is positioned in a horizontal state by a stopper 19. The rotating arm 17 is manually operated and can be easily operated in the rotating direction d with a certain amount of overpressure.

Each polishing mechanism 5 has a moving table 21 slidably supported on a bed 20 formed on a rotating arm 17.
An air cylinder 22 for driving the moving base 21 in one horizontal direction e, a motor 24 mounted on the moving base 21 via a support 23, and an output shaft 24a of the motor via a brush chuck 25. And a connected brush 26 for polishing.

The polishing brush 26 is constructed by integrally mounting a rotating cylinder 27 on a mounting shaft 26a, and brushing bristles 28 on the inner peripheral portion of the rotating cylinder 27 in a centripetal manner. It is possible to grind while the threaded portion A1 of A is fitted. The bristles 28 of the brush 26 are planted in a base frame 28a, and the base frame 28a is detachably and replaceably held by the rotating cylinder 27. An arm 39 is provided above the brush 26 so as to project toward the tip side of the brush 26, and the tip of the arm 39 detects the tip position of the bolt A to activate the motor 24. A bolt detection switch 40 for stopping 24 is provided.

Reference numeral 29 is a supply mechanism for automatically supplying the bolt A, which is arranged in the bolt supply portion B which is the rising side of the rotating body 2, and 30 is a discharge mechanism for automatically discharging the bolt A, which is on the descending side. It is arranged in a certain bolt discharge part D.

However, at the time of polishing, the bolt A is sequentially supplied from the supply mechanism 29 to the bolt receiver 3 at the bolt supply portion B set on the rising side of the rotating body 2 and supported by the bolt receiver 3. The bolt A is driven by the rotating body,
It is intermittently conveyed upward. The sensor 31 detects the supply state of the bolt to the bolt receiver 3.

The conveyed bolt A is stopped by the proximity sensor 14 at the polishing portion C, which is the upper rotation position, through the rotating body 2, and the chucking mechanism 4 provided at the position corresponding to this stop position. , The bolt is gripped at a substantially intermediate position in the axial direction and lifted up, and stopped at a predetermined lifted position (see FIG. 1) to be positioned and fixed.

With respect to the positioned bolt A, each polishing mechanism 5 moves (advances) from both sides in the axial direction of the bolt A during the stop time set in the intermittent drive. And
When the tip of the brush A is detected by the bolt detection switch 40, the motor 24 is activated and the brush 26 starts to rotate, and the screw portion A1 is ground by moving forward and backward with a constant stroke, for example, a stroke of 100 mm. . After both screw parts A1 have been polished by the rotary brush type operation in this way, the polishing mechanism 5 separates (retracts) along the axial direction of the bolt A, and the halt detection switch 40 detects that the brush 26 has separated from the bolt A. Then, the motor 24 stops. Then, the chucking mechanism 4 descends and the polished bolt A is returned to the bolt receiver 3 again. After that, the rotating body 2 is again intermittently rotated, and the next bolt A
Is stopped at the upper rotational position, and the gripping mechanism 4 and the polishing mechanism 5 perform the polishing action in the same manner as described above.

The bolt A returned to the bolt receiver 3 is supplied downward by the rotating body 2 and then automatically discharged to the discharging mechanism 30 at the discharging portion D.

Therefore, according to this embodiment, only by supplying the bolt A, which is the object to be polished, to the bolt receiver 3, the chucking mechanism 4 automatically grips the bolt A and the rotary brush type polishing mechanism 5 is provided. Since the bolts A after polishing are automatically ejected by the ejecting mechanism 30 in succession, the series of operations for feeding, polishing, and ejecting the bolts is automatically performed continuously without requiring any manpower. The work efficiency can be improved and the work period can be shortened effectively. Particularly, in the polishing work of a large stud bolt for the turbine casing which is the bolt A according to the present embodiment, the labor can be significantly reduced as compared with the conventional work.

Moreover, since the polishing work for each bolt is mechanically performed and the finish is uniform, the polishing quality can be stabilized.

Although the above embodiment is applied to polishing a stud bolt having both screws, it is needless to say that it can be applied to a single screw bolt. In this case, only the polishing mechanism 5 on one side may be used.

[0035]

As described above, according to the automatic polishing apparatus of the present invention, a series of operations for supplying, polishing, and discharging the bolts can be automatically performed continuously without requiring any manpower, improving the work efficiency and the construction period. It is possible to effectively reduce the length and the like, and it is possible to significantly reduce the labor particularly for the polishing work of a large bolt for the turbine casing as compared with the conventional work. Moreover, a uniform finish can be obtained, and the polishing quality can be stabilized, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an automatic polishing apparatus according to the present invention.

FIG. 2 is a plan view of FIG.

3 is an enlarged side view of FIG.

FIG. 4 is a view showing a usage state of the chucking mechanism of the embodiment.

5 is a plan view of FIG.

[Explanation of symbols]

 2 Rotating body 3 Bolt receiver 4 Chucking mechanism 5 Polishing mechanism A Bolt A1 Screw part A2 Non-screw part B Bolt supply part D Bolt discharge part

Claims (1)

[Claims] 1. An endless belt-shaped rotating body, which is intermittently driven in one direction around a horizontal axis, and a pair of members facing each other at intervals in the rotating direction of the rotating body and in parallel with the axis of the rotating body. And a bolt receiver that is integrally rotatably provided on the rotary body and that is open to the outer peripheral side of the rotary body and detachably supports the vicinity of both ends of the plurality of bolts, and the bolts supported by the bolt receiver. The non-screwed part of the rotating body is detachably gripped at the upper moving position to move up and down, and the chucking mechanism stops once at the ascending position, and the bolt that is gripped and stopped by the chucking mechanism And a rotating brush type polishing mechanism for polishing the threaded portion of the bolt, the moving side being closer to the axial direction of the rotating body and the rising side of the rotating body being a bolt supplying section and the descending side being a bolt discharging section. Bolt self Dynamic polishing device.